<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <style>
            @import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');

            *,
            *::before,
            *::after {
                margin: 0;
                padding: 0;
                box-sizing: border-box;
            }

            :root {
                --bg-color: #222429;
                --primary-bg-color: #333740;
                --primary-color: #2c62f6;
                --text-color: #b1b8ca;
                --text-active: #ffffff;
                --button-hover-bg-color: #2b2e34;
                --border-color: #494d59;
                --dropdown-height: 0;
                --rotate-arrow: 0;
                --translate-value: 0;
                --list-opacity: 0;
                --transition-time: 0.4s;
                --transition-timing: cubic-bezier(0.25, 0.46, 0.45, 0.94);
                --border-radius: 1.4rem;
                --list-button-height: 4.6rem;
                --floating-icon-size: 26;
                --floating-icon-top: 0;
                --floating-icon-left: 0;
            }

            html {
                font-size: 62.5%;
            }

            html,
            body {
                height: 100%;
            }

            body {
                display: flex;
                flex-direction: column;
                align-items: center;
                background-color: var(--bg-color);
                padding: 1.5rem;
                line-height: 1.4;
            }

            button {
                border: none;
                cursor: pointer;
                background-color: transparent;
                outline: none;
            }

            svg {
                height: 1.6rem;
                width: 1.6rem;
            }

            .text-truncate {
                text-overflow: ellipsis;
                overflow: hidden;
                white-space: nowrap;
            }

            .dropdown-container {
                margin-top: 30vh;
                display: flex;
                flex-direction: column;
                width: 100%;
                max-width: 34rem;
            }

            .dropdown-title-icon,
            .dropdown-arrow {
                display: inline-flex;
            }

            .dropdown-title {
                margin: 0 auto 0 1.8rem;
                text-transform: capitalize;
            }

            .dropdown-button {
                font-family: 'Roboto', sans-serif;
                font-weight: 400;
                font-size: 1.7rem;
                display: flex;
                align-items: center;
                padding: 0 1.8rem;
            }

            .dropdown-button svg {
                transition: all var(--transition-time) var(--transition-timing);
                fill: var(--text-color);
            }

            .dropdown-button svg,
            .dropdown-button span {
                pointer-events: none;
            }

            .dropdown-button:hover,
            .dropdown-button:focus {
                color: var(--text-active);
            }

            .dropdown-button:hover svg,
            .dropdown-button:focus svg {
                fill: var(--text-active);
            }

            .main-button {
                height: 5.2rem;
                border-radius: var(--border-radius);
                color: var(--text-color);
                background-color: var(--primary-bg-color);
                border: 0.1rem solid var(--border-color);
                transition: all var(--transition-time) var(--transition-timing);
            }

            .main-button:focus {
                border: 0.1rem solid var(--primary-color);
                box-shadow: 0 0 0 0.2rem rgba(44, 98, 246, 0.4);
            }

            .main-button .dropdown-arrow {
                transition: transform var(--transition-time) var(--transition-timing);
                transform: rotate(var(--rotate-arrow));
                margin-left: 1.8rem;
            }

            .list-button {
                height: var(--list-button-height);
                transition: color var(--transition-time) var(--transition-timing);
                color: var(--text-color);
                overflow: hidden;
                cursor: none;
            }

            .dropdown-list-container {
                overflow: hidden;
                max-height: var(--dropdown-height);
                transition: max-height var(--transition-time) var(--transition-timing);
            }

            .dropdown-list-wrapper {
                margin-top: 1rem;
                padding: 1rem;
                background-color: var(--primary-bg-color);
                border-radius: var(--border-radius);
                border: 0.1rem solid var(--border-color);
                position: relative;
            }

            ul.dropdown-list {
                position: relative;
                list-style-type: none;
            }

            ul.dropdown-list::before {
                content: '';
                position: absolute;
                top: 0;
                right: 0;
                left: 0;
                z-index: 0;
                opacity: 0;
                height: var(--list-button-height);
                background-color: var(--button-hover-bg-color);
                transition: all var(--transition-time) linear;
                transform: translateY(var(--translate-value));
                border-radius: var(--border-radius);
                pointer-events: none;
            }
            ul.dropdown-list:hover::before,
            ul.dropdown-list:hover ~ .floating-icon {
                opacity: 1;
            }

            li.dropdown-list-item {
                display: flex;
                flex-direction: column;
                position: relative;
                z-index: 1;
                opacity: var(--list-opacity);
                transition: opacity 0.8s var(--transition-timing);
            }

            .floating-icon {
                height: calc(var(--floating-icon-size) * 1px);
                width: calc(var(--floating-icon-size) * 1px);
                position: absolute;
                top: var(--floating-icon-top);
                left: var(--floating-icon-left);
                background-color: var(--border-color);
                border-radius: 1rem;
                pointer-events: none;
                opacity: 0;
                transition: opacity var(--transition-time) var(--transition-timing);
                z-index: 2;
                display: inline-flex;
                align-items: center;
                justify-content: center;
            }

            .floating-icon svg {
                fill: var(--text-active);
            }
        </style>
    </head>
    <body>
        <div class="dropdown-container">
            <button class="dropdown-button main-button">
                <span class="dropdown-title-icon">
                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
                        <path
                            d="M16 8.049c0-4.446-3.582-8.05-8-8.05C3.58 0-.002 3.603-.002 8.05c0 4.017 2.926 7.347 6.75 7.951v-5.625h-2.03V8.05H6.75V6.275c0-2.017 1.195-3.131 3.022-3.131.876 0 1.791.157 1.791.157v1.98h-1.009c-.993 0-1.303.621-1.303 1.258v1.51h2.218l-.354 2.326H9.25V16c3.824-.604 6.75-3.934 6.75-7.951z"
                        />
                    </svg>
                </span>
                <span class="dropdown-title text-truncate">Facebook</span>
                <span class="dropdown-arrow">
                    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
                        <path
                            d="M7.247 11.14 2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z"
                        />
                    </svg>
                </span>
            </button>
            <div class="dropdown-list-container">
                <div class="dropdown-list-wrapper">
                    <ul class="dropdown-list"></ul>
                    <div class="floating-icon" aria-hidden="true"></div>
                </div>
            </div>
        </div>
    </body>
    <script>
        const root = document.documentElement
        const dropdownTitleIcon = document.querySelector('.dropdown-title-icon')
        const dropdownTitle = document.querySelector('.dropdown-title')
        const dropdownList = document.querySelector('.dropdown-list')
        const mainButton = document.querySelector('.main-button')
        const floatingIcon = document.querySelector('.floating-icon')

        const icons = {
            linkedin:
                'M0 1.146C0 .513.526 0 1.175 0h13.65C15.474 0 16 .513 16 1.146v13.708c0 .633-.526 1.146-1.175 1.146H1.175C.526 16 0 15.487 0 14.854V1.146zm4.943 12.248V6.169H2.542v7.225h2.401zm-1.2-8.212c.837 0 1.358-.554 1.358-1.248-.015-.709-.52-1.248-1.342-1.248-.822 0-1.359.54-1.359 1.248 0 .694.521 1.248 1.327 1.248h.016zm4.908 8.212V9.359c0-.216.016-.432.08-.586.173-.431.568-.878 1.232-.878.869 0 1.216.662 1.216 1.634v3.865h2.401V9.25c0-2.22-1.184-3.252-2.764-3.252-1.274 0-1.845.7-2.165 1.193v.025h-.016a5.54 5.54 0 0 1 .016-.025V6.169h-2.4c.03.678 0 7.225 0 7.225h2.4z',
            instagram:
                'M8 0C5.829 0 5.556.01 4.703.048 3.85.088 3.269.222 2.76.42a3.917 3.917 0 0 0-1.417.923A3.927 3.927 0 0 0 .42 2.76C.222 3.268.087 3.85.048 4.7.01 5.555 0 5.827 0 8.001c0 2.172.01 2.444.048 3.297.04.852.174 1.433.372 1.942.205.526.478.972.923 1.417.444.445.89.719 1.416.923.51.198 1.09.333 1.942.372C5.555 15.99 5.827 16 8 16s2.444-.01 3.298-.048c.851-.04 1.434-.174 1.943-.372a3.916 3.916 0 0 0 1.416-.923c.445-.445.718-.891.923-1.417.197-.509.332-1.09.372-1.942C15.99 10.445 16 10.173 16 8s-.01-2.445-.048-3.299c-.04-.851-.175-1.433-.372-1.941a3.926 3.926 0 0 0-.923-1.417A3.911 3.911 0 0 0 13.24.42c-.51-.198-1.092-.333-1.943-.372C10.443.01 10.172 0 7.998 0h.003zm-.717 1.442h.718c2.136 0 2.389.007 3.232.046.78.035 1.204.166 1.486.275.373.145.64.319.92.599.28.28.453.546.598.92.11.281.24.705.275 1.485.039.843.047 1.096.047 3.231s-.008 2.389-.047 3.232c-.035.78-.166 1.203-.275 1.485a2.47 2.47 0 0 1-.599.919c-.28.28-.546.453-.92.598-.28.11-.704.24-1.485.276-.843.038-1.096.047-3.232.047s-2.39-.009-3.233-.047c-.78-.036-1.203-.166-1.485-.276a2.478 2.478 0 0 1-.92-.598 2.48 2.48 0 0 1-.6-.92c-.109-.281-.24-.705-.275-1.485-.038-.843-.046-1.096-.046-3.233 0-2.136.008-2.388.046-3.231.036-.78.166-1.204.276-1.486.145-.373.319-.64.599-.92.28-.28.546-.453.92-.598.282-.11.705-.24 1.485-.276.738-.034 1.024-.044 2.515-.045v.002zm4.988 1.328a.96.96 0 1 0 0 1.92.96.96 0 0 0 0-1.92zm-4.27 1.122a4.109 4.109 0 1 0 0 8.217 4.109 4.109 0 0 0 0-8.217zm0 1.441a2.667 2.667 0 1 1 0 5.334 2.667 2.667 0 0 1 0-5.334z',
            facebook:
                'M16 8.049c0-4.446-3.582-8.05-8-8.05C3.58 0-.002 3.603-.002 8.05c0 4.017 2.926 7.347 6.75 7.951v-5.625h-2.03V8.05H6.75V6.275c0-2.017 1.195-3.131 3.022-3.131.876 0 1.791.157 1.791.157v1.98h-1.009c-.993 0-1.303.621-1.303 1.258v1.51h2.218l-.354 2.326H9.25V16c3.824-.604 6.75-3.934 6.75-7.951z',
            twitter:
                'M5.026 15c6.038 0 9.341-5.003 9.341-9.334 0-.14 0-.282-.006-.422A6.685 6.685 0 0 0 16 3.542a6.658 6.658 0 0 1-1.889.518 3.301 3.301 0 0 0 1.447-1.817 6.533 6.533 0 0 1-2.087.793A3.286 3.286 0 0 0 7.875 6.03a9.325 9.325 0 0 1-6.767-3.429 3.289 3.289 0 0 0 1.018 4.382A3.323 3.323 0 0 1 .64 6.575v.045a3.288 3.288 0 0 0 2.632 3.218 3.203 3.203 0 0 1-.865.115 3.23 3.23 0 0 1-.614-.057 3.283 3.283 0 0 0 3.067 2.277A6.588 6.588 0 0 1 .78 13.58a6.32 6.32 0 0 1-.78-.045A9.344 9.344 0 0 0 5.026 15z',
            youtube:
                'M8.051 1.999h.089c.822.003 4.987.033 6.11.335a2.01 2.01 0 0 1 1.415 1.42c.101.38.172.883.22 1.402l.01.104.022.26.008.104c.065.914.073 1.77.074 1.957v.075c-.001.194-.01 1.108-.082 2.06l-.008.105-.009.104c-.05.572-.124 1.14-.235 1.558a2.007 2.007 0 0 1-1.415 1.42c-1.16.312-5.569.334-6.18.335h-.142c-.309 0-1.587-.006-2.927-.052l-.17-.006-.087-.004-.171-.007-.171-.007c-1.11-.049-2.167-.128-2.654-.26a2.007 2.007 0 0 1-1.415-1.419c-.111-.417-.185-.986-.235-1.558L.09 9.82l-.008-.104A31.4 31.4 0 0 1 0 7.68v-.123c.002-.215.01-.958.064-1.778l.007-.103.003-.052.008-.104.022-.26.01-.104c.048-.519.119-1.023.22-1.402a2.007 2.007 0 0 1 1.415-1.42c.487-.13 1.544-.21 2.654-.26l.17-.007.172-.006.086-.003.171-.007A99.788 99.788 0 0 1 7.858 2h.193zM6.4 5.209v4.818l4.157-2.408L6.4 5.209z'
        }

        const listItems = ['Linkedin', 'Instagram', 'Facebook', 'Twitter', 'Youtube']

        const iconTemplate = (path) => {
            return `
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16">
      <path d="${path}" />
    </svg>
  `
        }

        const listItemTemplate = (text, translateValue) => {
            return `
    <li class="dropdown-list-item">
      <button class="dropdown-button list-button" data-translate-value="${translateValue}%">
        <span class="text-truncate">${text}</span>
      </button>
    </li>
  `
        }

        const renderListItems = () => {
            dropdownList.innerHTML += listItems
                .map((item, index) => {
                    return listItemTemplate(item, 100 * index)
                })
                .join('')
        }

        window.addEventListener('load', () => {
            renderListItems()
        })

        const setDropdownProps = (deg, ht, opacity) => {
            root.style.setProperty('--rotate-arrow', deg !== 0 ? deg + 'deg' : 0)
            root.style.setProperty('--dropdown-height', ht !== 0 ? ht + 'rem' : 0)
            root.style.setProperty('--list-opacity', opacity)
        }

        mainButton.addEventListener('click', () => {
            const listWrapperSizes = 3.5 // margins, paddings & borders
            const dropdownOpenHeight = 4.6 * listItems.length + listWrapperSizes
            const currDropdownHeight = root.style.getPropertyValue('--dropdown-height') || '0'

            currDropdownHeight === '0'
                ? setDropdownProps(180, dropdownOpenHeight, 1)
                : setDropdownProps(0, 0, 0)
        })

        dropdownList.addEventListener('mouseover', (e) => {
            const translateValue = e.target.dataset.translateValue
            root.style.setProperty('--translate-value', translateValue)
        })

        dropdownList.addEventListener('click', (e) => {
            const clickedItemText = e.target.innerText.toLowerCase().trim()
            const clickedItemIcon = icons[clickedItemText]

            dropdownTitleIcon.innerHTML = iconTemplate(clickedItemIcon)
            dropdownTitle.innerHTML = clickedItemText
            setDropdownProps(0, 0, 0)
        })

        dropdownList.addEventListener('mousemove', (e) => {
            const iconSize = root.style.getPropertyValue('--floating-icon-size') || 0
            const x = e.clientX - dropdownList.getBoundingClientRect().x
            const y = e.clientY - dropdownList.getBoundingClientRect().y
            const targetText = e.target.innerText.toLowerCase().trim()
            const hoverItemText = icons[targetText]

            floatingIcon.innerHTML = iconTemplate(hoverItemText)
            root.style.setProperty('--floating-icon-left', x - iconSize / 2 + 'px')
            root.style.setProperty('--floating-icon-top', y - iconSize / 2 + 'px')
        })
    </script>
</html>
